kexec-tools: bump version and add support for crashdump kernel

split kexec-tools into two packages, kexec and kdump.
* kexec to simply execute a new kernel
* kdump is for loading and collecting debris of a crashed kernel with
  support for kdump forensics.

In order to properly support booting into a crashkernel, an init script
as well as UCI configuration has been added.
As modifying the kernel cmdline is required for this to work in x86
platforms use an uci-defaults script to modify /boot/grub/grub.cfg.

To test collecting crash information, use the 'c' sysrq-trigger, ie.
echo c > /proc/sysrq-trigger

This should result in the crash kernel being executed and (depending
on the configution) dmesg and/or vmcore getting saved.

To check if the crash kernel was loaded properly, use the 'status'
command of the kdump init script.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

1 files changed, 64 insertions, 16 deletions

diff --git a/package/boot/kexec-tools/Makefile b/package/boot/kexec-tools/Makefile
index ecd2a6ea11..1c686a2540 100644
--- a/package/boot/kexec-tools/Makefile
+++ b/package/boot/kexec-tools/Makefile
@@ -8,12 +8,12 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=kexec-tools
-PKG_VERSION:=2.0.14-rc1
+PKG_VERSION:=2.0.14
 PKG_RELEASE:=1
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.xz
 PKG_SOURCE_URL:=@KERNEL/linux/utils/kernel/kexec
-PKG_HASH:=3fc505ff8d8a2d24c68aac5e6b4783997d5a086966ff3de8b05a0ceb27e5e23b
+PKG_HASH:=ffb2e7e99d9d08754c6bc1922aed3c000094f318665d82a72ecc76c4ff1c0dc6
 
 PKG_FIXUP:=autoreconf
 
@@ -21,22 +21,49 @@ PKG_CONFIG_DEPENDS := CONFIG_KEXEC_ZLIB CONFIG_KEXEC_LZMA
 
 include $(INCLUDE_DIR)/package.mk
 
-define Package/kexec-tools
+define Package/kexec-tools/Default
   SECTION:=utils
   CATEGORY:=Utilities
-  DEPENDS:=@armeb||@arm||@i386||@x86_64||@powerpc64||@mipsel||@mips +KEXEC_ZLIB:zlib +KEXEC_LZMA:liblzma
-  TITLE:=Kernel boots kernel
   URL:=http://kernel.org/pub/linux/kernel/people/horms/kexec-tools/
   MAINTAINER:=Florian Fainelli <florian@openwrt.org>
-  MENU:=1
+endef
+
+define Package/kexec-tools
+  $(call Package/kexec-tools/Default)
+  TITLE:=kexec-tools transition meta package
+  DEPENDS:=+kexec
 endef
 
 define Package/kexec-tools/description
- kexec is a set of systems call that allows you to load
+ kexec is a set of system calls that allows you to load
  another kernel from the currently executing Linux kernel.
+ The kexec utility allows to load and boot another kernel.
 endef
 
-define Package/kexec-tools/config
+define Package/kexec
+  $(call Package/kexec-tools/Default)
+  TITLE:=Kernel boots kernel
+  DEPENDS:=\
+	@armeb||@arm||@i386||@x86_64||@powerpc64||@mipsel||@mips \
+	+KEXEC_ZLIB:zlib +KEXEC_LZMA:liblzma @KERNEL_KEXEC
+endef
+
+define Package/kexec/description
+ The kexec utility allows to load and boot another kernel.
+endef
+
+define Package/kdump
+  $(call Package/kexec-tools/Default)
+  TITLE:=Kernel crash analysis
+  DEPENDS:=+kexec @i386||@x86_64||@arm @KERNEL_CRASH_DUMP
+endef
+
+define Package/kdump/description
+ The kdump package allows to automatically boot into a
+ special kernel for analyzing kernel crashes using kdump.
+endef
+
+define Package/kexec/config
 	source "$(SOURCE)/Config.in"
 endef
 
@@ -65,24 +92,45 @@ CONFIGURE_VARS += \
 	BUILD_CC="$(HOSTCC)" \
 	TARGET_CC="$(TARGET_CC)"
 
-kexec-extra-sbin-$(CONFIG_KEXEC_TOOLS_kdump) += kdump
-
 define Build/Compile
 	$(MAKE) -C $(PKG_BUILD_DIR) DESTDIR="$(PKG_INSTALL_DIR)" all install
 endef
 
 define Package/kexec-tools/install
+	:
+endef
+
+define Package/kexec/install
 	$(INSTALL_DIR) $(1)/usr/sbin
-	$(INSTALL_BIN) \
-		$(addprefix $(PKG_INSTALL_DIR)/usr/sbin/, \
-			$(kexec-extra-sbin-y)) \
-		$(kexec-extra-bin-y) \
-		$(PKG_INSTALL_DIR)/usr/sbin/kexec \
-		$(1)/usr/sbin
+	$(INSTALL_BIN) $(PKG_INSTALL_DIR)/usr/sbin/kexec $(1)/usr/sbin
 
 # make a link for compatability with other distros
 	$(INSTALL_DIR) $(1)/sbin
 	$(LN) ../usr/sbin/kexec $(1)/sbin/kexec
 endef
 
+define Package/kdump/install
+	$(INSTALL_DIR) $(1)/usr/sbin $(1)/etc/init.d $(1)/etc/config $(1)/etc/uci-defaults
+	$(INSTALL_BIN) $(PKG_INSTALL_DIR)/usr/sbin/kdump $(PKG_INSTALL_DIR)/usr/sbin/vmcore-dmesg $(1)/usr/sbin
+	$(INSTALL_BIN) ./files/kdump.init $(1)/etc/init.d/kdump
+	$(INSTALL_BIN) ./files/kdump.defaults $(1)/etc/uci-defaults/kdump
+	$(INSTALL_CONF) ./files/kdump.config $(1)/etc/config/kdump
+endef
+
+define Package/kdump/prerm
+#!/bin/sh
+
+case $$(uname -m) in
+	i?86|x86_64)
+		if grep -q " crashkernel=" /boot/grub/grub.cfg; then
+			mount /boot -o remount,rw
+			sed -i 's/ crashkernel=[^ ]*//' /boot/grub/grub.cfg
+			mount /boot -o remount,ro
+		fi
+		;;
+esac
+endef
+
 $(eval $(call BuildPackage,kexec-tools))
+$(eval $(call BuildPackage,kexec))
+$(eval $(call BuildPackage,kdump))